Abstract: The dislosed invention is a toy of the type having a base or picture plate, which may have a partial picture thereon, over which magnetic particles are moved by a magnet or stylus over the base plate and deposit the particles thereon to decorate a partial picture or create an entire picture. The toy has a magnetic plate also and one plate is movable towards and away from the other so that when the plates are separated the particles are away from all or most of the influence of the magnetic plate and are more easily moved. When a picture has been completed the movable plate is moved adjacent to or in contact with the other plate so that magnetic attraction retains the particles in place on the base plate. In addition the toy in a more advanced form enables two or more colors to be used with pellets of different dimensions with each dimension or diameter of pellet being of one color and another diameter being of another color and the sizes and hence colors being separable from each other after use by screening.

Abstract: A damping mechanism is disclosed for damping the oscillations of the rotor hub which are coupled with periodic motions of the fuselage when on the ground, known as ground resonance, and a waddle when in the air. The rotor includes a freely tiltable rotor head mounted on a non-rotatable universal joint having an outer gimbal ring and an inner ring carried by a pylon. The damping mechanism connected between a gimbal ring and the pylon combines the action of a fluid dashpot in tandem with spring means the output of which is connected into the linkage between the pilot stick and the swash plate. The tandem combination of dash pot and spring means delays the signal to the swash plate by about 90.degree. to insert a corrective movement into the swash plate with feathering of the blades to tilt the rotor thrust vector which damps the oscillations of the rotor hub. The invention includes the damping mechanism per se and its combination with the rotor and with the swash plate.

Abstract: A bead and a bead item is disclosed in which the bead has a projection extending therefrom having a dimension so that it can be pushed into a hole or groove in a grid and retained therein to make a bead design. The grid can be used in two ways in that it can serve as a permanent part of the bead structure or item after the design of beads has been built thereon or after the design has been completed the beads may be laced together with thread, wire, dowels and the like after which the bead projections are broken away at the bead body leaving the bead design without the grid. The projection may have a knob on the end thereof which is pressed into the hole or groove in the grid to more securely retain the bead on the grid. The beads may be of many different sizes and shapes. The grid may be thin or flexible enough so that it can be bent in forming a permanent part of the bead item. The grid can form a permanent backing such as for framing the bead design and other uses.

Abstract: A rotorcraft is subject to a rocking motion when on the ground, which is called ground resonance, and in the air which gives the fuselage a waddle type of motion about its center of gravity. both are a form of aeromechanical instability. This fuselage motion is coupled with and accompanied by bending oscillations of the blades with respect to the hub of the rotor of the rotorcraft. An oscillation damper is described which damps the oscillations of the aircraft and thereby eliminates or substantially reduces the rocking and waddle motion of the fuselage. The damper includes a seismic device having a mass-spring combination tuned to the frequency of the rocking motion which will typically be one half or approximately one half of the rotor revolutions per minute at cruising speed and is positioned laterally of and spaced from the center of gravity of the fuselage.

Abstract: A slitting machine is disclosed which feeds corrugated pipe through the machine intermittently and between the periods of pipe feeding when the pipe is stationary a plurality of angularly spaced saw sets are moved radially inward toward the machine axis and the pipe to cut slots through the wall thereof, and then withdrawn whereupon the cycle repeats. The pipe is fed through the machine by endless transporters equal in number to the saw sets and uniformly disposed angularly with respect to each other, the saw sets and the axis. The transporters have projections which fit into the corrugations of the pipe for a driving connection therewith. A saw set is located angularly between each pair of transporters so that a pair of the latter are roughly opposite to a saw set for an even number of sets or directly opposite a transporter for an odd number of sets.

Abstract: A pile joiner is disclosed for connecting together the ends of concrete piles which joiner includes a socket member and a mating member one of which is on the end of one pile and the other is on the end of the pile to be connected therewith. Each of these two members has a base plate with a central hole therethrough and a tubular element secured to each base plate and extending at right angles thereto. One tubular element is a socket element and the other is a mating element which is received within the socket element. The socket element and the mating element have at least a first sleeve means which includes a sleeve hole or holes through a wall or walls of each element and in alignment when the members are assembled together, an outer sleeve for each sleeve hole of the socket element extending outwardly and an inner sleeve for the sleeve hole or holes of the mating element extending inwardly or between sleeve holes in opposite walls thereof.

Abstract: A sheet withdrawing mechanism is disclosed for a collator having a plurality of spaced moving shelves or partitions forming pockets. Each partition or pocket receives a pile of sheets and as each pocket passes sheet withdrawing position, rotating spiders, preferably having a plurality of arms, each extend an arm into each pocket in succession, engage the top sheet of the pile and at least partially withdraw the sheet far enough to be reached by adjacent secondary withdrawing mechanism which completes the withdrawal of the sheet from the pocket. Two constructions of spiders are illustrated and described, one having relatively long arms for partition spacing having a relatively large dimension so that the arc of movement of the end of each arm is great enough to withdraw the sheet sufficiently solely by the sweep of the arm. The second spider construction is for partition spacing having a relatively lesser dimension so that a greater number of pockets can be provided in an over-all dimension.